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Asphaltene Reserve Stability Number

Rough stability screen - residual fuel is stable if Reserve = P-value − 1 ≥ 0.4. Values below 0.2 indicate impending asphaltene precipitation.

FuelStability
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Formula, assumptions, and limits

Reserve=Pvalue1\text{Reserve} = P_\text{value} - 1
SymbolMeaningUnit
PvalueP-valuePeptization value (ASTM D7060)
ReserveReserveP-value − 1

Source: ASTM D7060; ISO 8217 Annex F guidance

In short

Rough stability screen - residual fuel is stable if Reserve = P-value \u2212 1 \u2265 0.

Learn the theory Bunker Quality and ISO 8217 Marine Fuel Standards